[BUG] Ability to choose both video and image in SpecialPickerType.wechatMoment

[yanivshaked]

Bug description
When using SpecialPickerType.wechatMoment, I am able to select both image and video files.
I made sure that this bug is NOT related to the noPreview changes.

How to reproduce

• Run the example
• Click Single Asset picker page
• Click WeChat moment
• Click on an image to get its preview
• Select it using the "Select" button at the bottom bar
• Swipe right till you get a video asset
• Select it using the "Select" button at the bottom bar
• Click done

Expected behavior
Should not allow selection of video if image is already selected (and vice versa).

Screenshots (If contains)
If needed, I can upload a video.

Device information

• Device: Android OnePlus 8T
• OS: Android 10
• Package Version: 5.1.3 or 5.2.0 (reproduced on both)
• Flutter Version: 2.0.5

Additional context
Let me know what are your thoughts on solving this, I can submit a PR.

[AlexV525]

We should filtered selected assets with only images in WeChat Moment mode when pushToViewer is called.

[AlexV525]

And make the previewing video the only one in the preview list.

[AlexV525]

Nvm, I'll apply a quick fix to this.

[AlexV525]

@all-contributors Add @yanivshaked for bug.

[allcontributors]

@AlexV525

I've put up a pull request to add @yanivshaked! 🎉